.combotree-span{
    position: relative;
    display: block;
}
.combotree-span>i:after{
    position: absolute;
    top: 50%;
    right: 0;
    content: "\f107";
    display: inline-block;
    border: 0;
    font-family: FontAwesome;
    font-style: normal;
    font-weight: 400;
    margin-top: -9px;
    margin-right: 15px;
}
.combotree-panle{
    position: absolute;
    z-index:999;
    border: 1px solid #c2cad8;
    border-radius: 3px;
    margin-top: 5px;
    background: #FFF;
    overflow: auto;
}